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Triple Remote and Local Temperature Sensor with SMBus, I2C Interface and ACPI Compatible


Package | PIN: DBQ | 16
Temp: Q (-40 to 125)
Carrier: Partial Tube
Qty Price
1-9 $5.38
10-24 $4.84
25-99 $4.52
100-249 $4.05
250-499 $3.78
500-749 $3.29
750-999 $2.85
1000+ $2.79


  • Accurately senses die temperature of 3 remote ICs, or diode junctions
  • On-board local temperature sensing
  • SMBus and I2C compatible interface, supports SMBus 1.1 TIMEOUT
  • Two interrupt outputs: INT# and T_CRIT_A#
  • Register readback capability
  • 7 bit plus sign temperature data format, 1 °C resolution
  • 2 address select pins allow connection of 9 LM83s on a single bus

Key Specifications

[Solid_Square] Supply Voltage3.0V to 3.6V
[Solid_Square] Supply Current0.8mA (max)
[Solid_Square] Local Temp Accuracy (includes quantization error)
0°C to +85°C±3.0°C (max)
[Solid_Square] Remote Diode Temp Accuracy (includes quantization error)
+25°C to +100°C±3°C (max)
0°C to +125°C±4°C (max)

Texas Instruments  LM83CIMQA/NOPB

The LM83 is a digital temperature sensor with a 2 wire serial interface that senses the voltage and thus the temperature of three remote diodes using a Delta-Sigma analog-to-digital converter with a digital over-temperature detector. The LM83 accurately senses its own temperature as well as the temperature of three external devices, such as Pentium II® Processors or diode connected 2N3904s. The temperature of any ASIC can be detected using the LM83 as long as a dedicated diode (semiconductor junction) is available on the die. Using the SMBus interface a host can access the LM83's registers at any time. Activation of a T_CRIT_A# output occurs when any temperature is greater than a programmable comparator limit, T_CRIT. Activation of an INT# output occurs when any temperature is greater than its corresponding programmable comparator HIGH limit.

The host can program as well as read back the state of the T_CRIT register and the four T_HIGH registers. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM83. The sensor powers up with default thresholds of 127°C for T_CRIT and all T_HIGHs. The LM83 is pin for pin and register compatible with the LM84 as well as the Maxim MAX1617 and the Analog Devices ADM1021.